Wahl DST400 User manual

DSTCAL Software
User Manual
Palmer Wahl Instruments, Inc.
234 Old Weaverville Road
Asheville, NC 28804
Toll Free 800-421-2853
Phone [phone]
Fax [phone]
www.palmerwahl.com
09/16/09
WD1037 Rev F
Revised 01/11/21

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Table of Contents
1. INTRODUCTION........................................................................................... 4
1.1. DSTCAL.............................................................................................................4
1.2. DSTCAL-Pro......................................................................................................4
2. DSTCAL KIT INSTALLATION AND SETUP................................................ 5
2.1. Kit Contents........................................................................................................5
2.2. DSTCAL Software Installation............................................................................5
2.3. Hardware Installation .........................................................................................5
2.4. Driver Installation ...............................................................................................5
3. SCREEN DEFINITIONS –RTD Models....................................................... 6
4. CALIBRATION –RTD Models..................................................................... 9
4.1. Theory of Calibration..........................................................................................9
4.2. Meter Calibration................................................................................................9
4.3. Probe Calibration .............................................................................................11
4.4. Error Windows..................................................................................................12
5. SCREEN DEFINITIONS - DSX Models: .................................................... 13
6. CALIBRATION –DSX Current Loop ........................................................ 15
6.1. Theory of Calibration........................................................................................15
6.2. Current Loop Calibration..................................................................................15
4-20 mA Calibration Window..................................................................................15
7. DST600 PROBE ID..................................................................................... 16
7.1. Theory of Operation.........................................................................................16
7.2. Definitions ........................................................................................................16
...................................................................................................................................17
7.3. Probe Association............................................................................................17
8. SCREEN DEFINITIONS –Thermocouple Models.................................... 18
9. CALIBRATION –Thermocouple Models ................................................. 21
9.1. Theory of Calibration........................................................................................21
9.2. Meter Calibration..............................................................................................21
mV Meter Calibration Window.............................................................................21
Set Active Calibration? Window.........................................................................22
Set Factory Calibration? Window (DSTCAL-Pro only).......................................22
9.3. Cold Junction Compensation Calibration Window............................................23
Set Active Calibration? Window.........................................................................23
Set Factory Calibration? Window (DSTCAL-Pro only).......................................23
10. TROUBLESHOOTING................................................................................ 24

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1. INTRODUCTION
This software package is for use with the DST400, DST/DSX500 and DST600 family of
Digital Thermometers. There are 2 versions of software, one for customer use and one
for use by the factory. The version is indicated on the first line under the “Poll for
Module” button. The 2 versions are:
1.1.DSTCAL
Allows the following:
Setting of LCD Refresh (display update rate) for all models;
R0 Value for all RTD models;
Selection of Thermocouple Type for all Thermocouple models;
Programming of the 4-mA value, 20-mA value and burnout selection on the
DSX models;
Association and enabling of probe ID’s for DST600 series Models;
Setting of Low Battery Check rate;
Calibration of the meter’s measurement electronics, resistance input for RTD
models and mV input for T/C models;
Calibration of the meter and probe using an ice bath for RTD versions;
Calibration of the Cold Junction Compensation electronics for T/C versions;
Calibration of the 4-20 mA output circuit for DSX models
NOTE: This software does not calibrate the transmitter section of Models
DST620 or DST621, which require the transmitter manufacturer’s software
and interface module.
1.2.DSTCAL-Pro
Only available for the Wahl Factory, same as DSTCAL but also allows setting of
the unit’s serial number and setting of the Factory default calibration values.

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2. DSTCAL KIT INSTALLATION AND SETUP
2.1.Kit Contents
The DSTCAL Kit is delivered with a CD-ROM that includes the following files:
Application files
Autorun.inf
DSTCAL.application
Setup.exe
WD1035 –DSTCAL Load Instructions
WD1037 –DSTCAL User Manual
The DSTCAL kit also includes:
P/N Description
12436-07 Cable, USB2.0A to Mini-B, 5 pin, 6 Ft.
13506 DST/USB Interface Module
13507 Cable, DST/13506 Interface, 4 pin
2.2.DSTCAL Software Installation
1. Install DSTCAL CD-ROM into the computers CD drive and the “AutoPlay”
window should pop up.
2. Click on “Run setup.exe”
3. Follow the on-screen prompts.
2.3.Hardware Installation
1. Connect the 12436-07 cable, with the USB2.0A end to your PC’s USB port
and the Mini-B connector to the USB port on the DST/USB Interface
Module.
2. Connect the 4 pin cable assembly, p/n 13507, to the DST/USB Interface
Module port labeled “DIGI-STEM”.
3. With the Digi-Stem unit open, connect the opposite end of the 13507 cable
to J3 on the back of the PCB assembly with the RED wire going to Pin 1.
Pin 1 is marked on the PCB and is the pin closest to the blue jumper for
the °C/°F switch.
2.4.Driver Installation
Once the software is loaded and the hardware is connected, your computer may
report that it needs a driver for the interface box. Usually, the automatic driver
search window will find it. If not, you can manually load the driver by:
1. Open your web browser and go to www.ftdichip.com
2. On the left hand menu, click on “Drivers”, and then click on the sub menu
of “VCP Drivers”.
3. Scroll down to the table labeled “Currently supported VCP Drivers:”
4. Find your operating system, such as “Windows – X86 (32-bit) and click on
the version in the table, ie. 2.08.28.
5. Follow the auto install wizard.
6. Close the web browser.

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3. SCREEN DEFINITIONS –RTD Models
Wahl DST/DSX Series Calibration Software (vX.X.X.XX) window; reference Fig. 1.
Note: Rolling the mouse indicator over a title or box will show additional information on
the specific subject.
File:
Activation –This command allows entry of the Activation Key to change between
versions. User installation installs the DSTCAL version. Key for DSTCAL-Pro is only
available for the factory.
Check for updates –Checks the Wahl Instruments website (www.palmerwahl.com) to
see if there are updates available and reports status of your software. Software will
prompt you to download new software if it is available.
Exit –Closes the Calibration Software
Settings:
Fahrenheit / Celsius - Selects Fahrenheit or Celsius as the temperature scale to be
used when programming the 4 mA and 20 mA values (DSX models only).
SPY COM - Serial Communication Debug Tool. Not used during normal operation.
Help:
About –Displays software version and contact information for Wahl Instruments.
Select “OK” to close.
Poll for Module:
This button is used to establish communication between the PC and the Instrument
being programmed/calibrated. In some cases, it may need to be clicked multiple times,
but usually no more than three.
Select COM Port:
This button opens the COM port selection window. This is used to select the proper
COM port. If the COM port the module is connected to does not show, click “Refresh”
then “Scan All COM Ports”. Highlight the COM port and click “OK”.
Module Configuration Information
Module settings for S/N 99999001: Identifies serial number of instrument.
Size: Size of the configuration data in bytes.
Model: Identifies instruments model number currently connected to DSTCAL software.
Firmware Revision: Identifies firmware revision of instrument.
Build Date: Identifies date firmware was compiled.

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Build Time: Identifies time firmware was compiled.
Hardware Revision: Identifies Hardware revision level. This parameter is hard coded
into firmware.
Serial number: Identifies serial number of PCB, programmable on DSTCAL-Pro only.
LCD Refresh: Sets update period for the LCD. 1 period = 250 mS, thus, LCD Refresh:
2 = 500 mS or 0.5 second update rate for LCD. Default value is 8. LCD Refresh is not
available for model DST550, which is hard programmed for sample intervals.
Low Battery Check: Sets update period for checking of low battery. 1 period = 250
mS, thus Low Battery Check: 1200 = 300,000 mS or 5 minute interval for battery
checking.
Calibration Information
Module Calibration Data –RTD Models
Active Rref –Resistance of nominal 248 ohm reference resistor as calculated by
measurements during the Ohm Meter Calibration process.
Active Roffset –Offset value for reference resistor as calculated by measurements
during the Ohm Meter Calibration process.
R0 –Resistance at 0.0C. R0 value is used for calculating temperature from the
measured resistance. For the highest accuracy of measurements, it should be set to
match the R0 value of the probe being used. It may be manually entered or may be
automatically calculated and updated by performing “Probe (system) Calibration”. Box
will turn “red” if value is out of acceptable range of 100 10 ohms.
Select Calibration to Perform: The Drop down box allows the user to select one of two
calibration routines. To select, simply highlight the desired routine and click the
“Calibrate” button. A calibration routine with step by step instructions will take you
through the calibration process. See DSX section for DSX current loop calibration
instructions.
1) Ohm Meter Calibration –Performs the calibration of the Electronics to ensure
it accurately measures resistance. This routine requires the use of known
precision resistances. A precision resistor decade box or precision fixed
resistors may be used. Some electronic RTD simulators may also work, but we
recommend validating their use with the Digistem prior to using them for
calibration. R0 will automatically be set to 100.00 ohms for this calibration and
upon completion, the user will be given the option to return to the initial R0 or
leave it at 100.00 ohms.

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2) Probe (system) Calibration –Performs the calibration of the RTD probe to
the meter electronics. This method can be performed when equipment to
measure the probes R0 value is not available. This should not be performed if
the R0 value is manually entered into the R0 field.
Existing Meter Calibration Settings
Factory –These settings are the default settings and can only be set at the factory.
Active –These settings are the calibration coefficients used in calculating temperature
from the measured probe resistance. These may be changed by the user via the “Ohm
Meter Calibration” routine.
Restore Factory Settings –This button loads the “Active” settings registers with the
current values displayed under the “Factory” settings. This is used in the event the
“Active” settings have been corrupted by invalid calibration.
NOTE: Restoring the Factory settings will cause the current active settings to be
deleted. A new calibration will need to be performed if new “Active” settings need to be
acquired.
Showing info box when mouse is over “LCD Refresh:” title.
Fig. 1

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4. CALIBRATION –RTD Models
4.1.Theory of Calibration
With respect to calibration, the RTD thermometer can be viewed as two independent
systems with different calibration requirements.
The first system is comprised of the meter electronics. The meter calibration is
performed so that the meter will measure resistance accurately. This is accomplished
by using known, fixed resistances of a specified accuracy. Wahl recommends using
resistances with a known accuracy equal to or greater than 0.009 ohms. The
calibration routine also allows entry of the exact resistance. This will allow the
technician to enter the calibrated resistor value from a NIST traceable laboratory data
sheet or by measuring a nominal valued resistance with a precision ohmmeter, such as
an HP3458A, and entering the measured value. See “METER CALIBRATION” below
for details.
The second system is the addition of a specific probe to the meter. Due to
manufacturing processes, there are variations in the RTD’s R0 coefficient. To increase
the total system accuracy, the electronics may be programmed with this value so that
the microprocessor can accurately calculate the actual temperature from the measured
resistance. See “PROBE CALIBRATION” below for details.
4.2.Meter Calibration
Ohm Meter Calibration Window
Selecting Resistance Screen
1. Sets R0 to 100 ohms in the event it is set otherwise.
2. Prompts user to “Connect 50 ohm Standard Resistance to Meter Input”
(90 ohm for DST600 series), user may optionally enter exact value of
Resistance into the “Measured Resistance” box. Box will turn “red” if
value is out of acceptable range.
3. Click “Next” to continue (Clicking “Cancel” will return to main screen).
Waiting for Stabilization Screen
4. Unit waits 10 seconds for stabilization of capacitors
Averaging Samples Screen
5. Unit takes 10 readings to average for calibration
Selecting Resistance Screen
6. Prompts user to “Connect 280 ohm Standard Resistance to Meter
Input” (194.1 ohm for DST600 series), user may optionally enter exact
value of Resistance into the “Measured Resistance” box.
7. Click “Next” to continue (Clicking “Cancel” will return to main screen).
Waiting for Stabilization Screen
8. Unit waits 10 seconds for stabilization of capacitors

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Averaging Samples Screen
9. Unit takes 10 readings to average for calibration
Finalizing Calibration Screen
10.Displays results of calibration
11.Click “Set Calibration” to continue (Clicking “Cancel” will return to main
screen).
Set Active Calibration? Window
12.Do you wish to calibrate the module with the values below?
Set Active calibration pair to:
(xxx.xxxx, x.xxxx)
13.Click “Yes” to continue. Clicking “No” will return to Finalizing
Calibration Screen. “Pro” version will send to “Set Factory
Calibration?” window, below.
Set Factory Calibration? Window (DSTCAL-Pro only)
14.Do you wish to calibrate the module with the values below?
Set Factory calibration pair to:
(xxx.xxxx, x.xxxx)
15.Click “Yes” to continue or “No” to return to Finalizing Calibration
Screen
Meter Calibration Success Window
16.One of the following 3 messages will be displayed, depending on
previous choices:
A meter calibration was performed successfully on this module.
Both Active and Factory calibration set to:
(xxx.xxxx, -x.xxxxxx)
A meter calibration was performed successfully on this module.
Only Active calibration set to:
(xxx.xxxx, -x.xxxxxx)
A meter calibration was performed successfully on this module.
Only Factory calibration set to:
(xxx.xxxx, -x.xxxxxx)
17.Click “OK”. Program displays the following message: